Require Django Haystack 2.3.1 at a minimum.

Review Request #7179 — Created April 7, 2015 and submitted — Latest diff uploaded

Information

Review Board
release-2.0.x
bc8b016...

Reviewers

We had a report of Haystack 2.3.0 failing to index, due to the top-level
djblets module not having a models.py. 2.3.1 fixes this. We now require
at least this version.

The original reporter verified that this fixed the problem.

Built the package.